Can CEA And Hostel Subsidy Be Claimed Concurrently?

Can CEA And Hostel Subsidy Be Claimed Concurrently? The fact that both CEA and Hostel subsidy can be admitted concurrently has also been confirmed by HQrs Office vide their letter No. AN/XIV/14114/ Other Allowances dated 5.12. 2019 (addressed to PCDA Bangalore). Is there any time limit for claiming CEA? 24,750 and Hostel Subsidy will be